Rock-drill.



G. JACKSON.

BOOK DRILL.

APPLIGATIOH FILED MAYO}, 1010.

lmmm Patented 00t.14,1913.

Witnesses: H I nventcaii z- COTWiH Ja zFmacn b3 His mtljav-ne STATES; PATENT QFEKC EL COBWILL JACKSON, OE MADISON; WISGONSIN; ASSIGNOB T10 GENERAL ELEGTBIG I GOMQBANZ, A; CORIOltA'JZION. OF NEW YORK.-

' ROCK-DRILL.

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Specification of Letters Patent.

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Be it known that I, Gorrwmn JACKSON", a tizmof the United States, residing at Madison, in the county of Dane, State of Wisconsin, have invented certain new and useful Im rovements Rock-Drills, of which the ollowing is a specification.

My invention relates to mining drills par.- ticularly adopted for: cuttingrock on other hard mineral substances.

In machine-drilling it is impracticable to maintain accurate alinement between the machine, whieh is usually mounted on a tripod and subject to violent vibration, and the hole being drilled, and in order to avoid the rubbingof the sides of the drill steel against the sides of the hole, the steel is made with a bit of considerably greater diameter than the rest of the steel, but drills of this construction have been found objectionable for the I reason that the dust, cuttings and crushed material incident to drilling operations often accumulate immediately back of the cutting bit around the body of the drill steel and 'upon the drill during form there a hard unyielding and binding This collar causes undue friction its operation and prevents a free and rea y removal of the same from the bore. Moreover, such packing'or jamming of the loose material is aggravated 1n a twist percussion drill by the reci meeting movements of the beveled spiral anges, resultin in a partial chokin of thedrill, ge o the rearward material from the collar.

progress of the bore.

The object of this invention is to provide a drill which will avoid these inconveniences. In applying my invention, I may make use of the ordinary twist percussiondrill steel with a bit of greater diameter than the groun diameter of its spiral conveying flanges.

Upon these flanges I form projections in such a manner and of such a form, while not interfering with the continuity rand the rigidity of the spiral conveyer, as to stir up and maintain the round materials in a loose conveyable form furing the operation of the drill. v

The salient points of my invention will be particularly pointed out in the appended claims, but for a detailed description reference maybe had to the specification, of which the following drawings form a part.

Figure 1 is a perspective view of a twist than the diameter of said conveyer,

pena ssion drill steel-'withapart ofthe body or sp ralconveyer and head broken away, to

ether with-asect'ion ehmogh the bore and 2 is; a bottom. rejection.

hecutting' or ril ing bit of the drill, shown at 1-, "be, otfi any' convenient form, the only reqiusite being that its horebe greater than the diameter of the flanges 2, 2' of the spiral conveyer.- These -flanges arepmvided withflintegral outwardly proecting or radialfstirring' lugs 3 which preferably extend to a proximatelythe bore limit or diameter '0 the cutting bit- In the drawlngs, four of these lu are own,-

but my invention is not to be mited to this number. It should be noted that the leading faces 4 of these lu are-arranged toward but inclined to t e directiouof the drilling bit so as to be effective in preventing clogging or jamming of the loose mate rials during both 'theretative' and the forward movements; a

At 5 is shown the upperpart ofa circular head or shank whic receives the heavy hammer blows.

6 re resents the rock or other mineral to be dri led andat 7 is shown the cuttingsinv loose form during the drilling operation. 1

I have shown my invention applied to a twist-drill of such strength and rigidity of parts as to withstand the heavy hammer blows incident to percussive rock drilling, but it is to be understood that it is applicable to any drill provided with a-contlnuous spiral conveyer of smaller diameter than the bore of the cutting bit.

What I claim as new'and desire to secure by Letters Patent of the United States, is-

1. A percussion drill steel havingla continuous'spiral conveyer provided with in-- tegral lugs projecting outwardly from the conveyer edges, and a cutting bitoi greater diameter than the diameter of the sand conveyer, the diameter of the integral lugs b9- greater than that of the conveyer. 5

ing

A percussion drill steel having a 'con-' taco tinuous' s iral conveyer provided with in.- I

tegral ra 1al stirring lugs upon the conveyer edges, and a cutting bit of greater dlafinegler t e 1 ameter of the integral lugs beln'g greater than that of the conveyer.

3. A percussion drillsteel-havmg a cutting bit and a continuous spiral conveyer faces whose edges are substantially at right angles to the axis of the drill projecting outwardly from the conveyer edges-and ex- -tend1ng to approximately the diameter of the cutting bit.

4. A twlst percussion'drill steel continuous spiral conveyer which is provided with integral stirring lugs projecting outwardly from the eonveyer edges and Whose cutter is greater than the diameter of the conveyer, the diameter of the lugs being greater than that of the conveyer.

5. A twist percussion drill steel having a bit and conveyer flanges provided with out wardly projecting cutting lugs having their leading faces dis osed transversely to the spiral flanges and whose cutter is greater than the diameter of the conveyer flanges, the diameter of the lugs being greater than that of the flanges.

6. A twist percussion drill steel having a bit and spiral flanges rovided with inte ral radial stirrin lugs liaving their leading faces disposed transversely to the spiral flan es and substantially parallel to and exten ing to approximately the diameter of the drill. a

In witness whereof, I have hereunto set my hand this 25th day of May, 1910.

OORWILL JACKSON.

' Witnesses ALVA L. SEARLES, A. J. BUENZLI. 

